Abstract
Mn-Based perovskite oxides combined with a temperature swing adsorption (TSA) process were employed for Hg0 adsorption and regeneration from coal-fired flue gas, in which oxygen directly acted as oxidant to enhance the capture of Hg0. Three kinds of Mn-based perovskie oxides, SrMnO3, LaMnO3 and CeMnO3 were evaluated. The results indicated that the performances for Hg0 removal decreased in the order of LaMnO3>CeMnO3>SrMnO3. LaMnO3 had a Hg0 capacity of 6.22mg/g with 4% O2 at 150°C. O2 significantly enhanced the reaction activity, the Hg0 capacity was increased by approximately 6.5% in the presence of 8% O2. The characterization results indicated that perovskite crystal structure was beneficial for Hg0 capture. The Hg0 removal mechanism was primary ascribed to catalytic oxidation and chemical-adsorption. The abundant of adsorbed oxygen, high ratio of Mn4+/Mn3+ in LaMnO3 lead to the high activity. Moreover, LaMnO3 can be regenerated without the loss of capacity. The released Hg0 could be gathered which prevent from mercury secondary pollution in the environment.
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